// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Tests of CancellationFlag class.

#include "base/synchronization/cancellation_flag.h"

#include "base/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/spin_wait.h"
#include "base/threading/thread.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/platform_test.h"

namespace base {

namespace {

    //------------------------------------------------------------------------------
    // Define our test class.
    //------------------------------------------------------------------------------

    void CancelHelper(CancellationFlag* flag)
    {
#if GTEST_HAS_DEATH_TEST
        ASSERT_DEBUG_DEATH(flag->Set(), "");
#endif
    }

    TEST(CancellationFlagTest, SimpleSingleThreadedTest)
    {
        CancellationFlag flag;
        ASSERT_FALSE(flag.IsSet());
        flag.Set();
        ASSERT_TRUE(flag.IsSet());
    }

    TEST(CancellationFlagTest, DoubleSetTest)
    {
        CancellationFlag flag;
        ASSERT_FALSE(flag.IsSet());
        flag.Set();
        ASSERT_TRUE(flag.IsSet());
        flag.Set();
        ASSERT_TRUE(flag.IsSet());
    }

    TEST(CancellationFlagTest, SetOnDifferentThreadDeathTest)
    {
        // Checks that Set() can't be called from any other thread.
        // CancellationFlag should die on a DCHECK if Set() is called from
        // other thread.
        ::testing::FLAGS_gtest_death_test_style = "threadsafe";
        Thread t("CancellationFlagTest.SetOnDifferentThreadDeathTest");
        ASSERT_TRUE(t.Start());
        ASSERT_TRUE(t.message_loop());
        ASSERT_TRUE(t.IsRunning());

        CancellationFlag flag;
        t.task_runner()->PostTask(FROM_HERE, base::Bind(&CancelHelper, &flag));
    }

} // namespace

} // namespace base
